{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro\n\nIn the TDX_HYPERCALL asm, after the TDCALL instruction returns from the\nuntrusted VMM, the registers that the TDX guest shares to the VMM need\nto be cleared to avoid speculative execution of VMM-provided values.\n\nRSI is specified in the bitmap of those registers, but it is missing\nwhen zeroing out those registers in the current TDX_HYPERCALL.\n\nIt was there when it was originally added in commit 752d13305c78\n(\"x86/tdx: Expand __tdx_hypercall() to handle more arguments\"), but was\nlater removed in commit 1e70c680375a (\"x86/tdx: Do not corrupt\nframe-pointer in __tdx_hypercall()\"), which was correct because %rsi is\nlater restored in the \"pop %rsi\".  However a later commit 7a3a401874be\n(\"x86/tdx: Drop flags from __tdx_hypercall()\") removed that \"pop %rsi\"\nbut forgot to add the \"xor %rsi, %rsi\" back.\n\nFix by adding it back."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/x86/coco/tdx/tdcall.S"
               ],
               "versions": [
                  {
                     "version": "7a3a401874be",
                     "lessThan": "2191950d35d8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "7a3a401874be",
                     "lessThan": "de4c5bacca4f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "7a3a401874be",
                     "lessThan": "5d092b66119d",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/x86/coco/tdx/tdcall.S"
               ],
               "versions": [
                  {
                     "version": "6.4",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.4",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.5.12",
                     "lessThanOrEqual": "6.5.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.2",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/2191950d35d8f81620ea8d4e04d983f664fe3a8a"
            },
            {
               "url": "https://git.kernel.org/stable/c/de4c5bacca4f50233f1f791bec9eeb4dee1b14cd"
            },
            {
               "url": "https://git.kernel.org/stable/c/5d092b66119d774853cc9308522620299048a662"
            }
         ],
         "title": "x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2023-52874",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}